What do breast lines do when used on a ship?

Breast lines are a type of mooring line used primarily to control the distance of the ship from the pier when the vessel is docked. These lines are typically run from the ship’s side to the pier, helping to prevent the vessel from drifting away or getting too close to the pier. By tensioning these lines, crew members can ensure that the ship maintains a safe and stable position alongside the pier, which is crucial for safe operations during loading and unloading, as well as for the safety of personnel on board and on the pier.

This function is vital, especially in busy harbor areas where ships may need to dock and undock frequently. While other lines, such as bow and stern lines, play roles in controlling the ship’s movement forward and backward, breast lines specifically focus on controlling lateral movement and distance from the dock. Understanding this function is key for effective mooring and ensuring safe harbor operations.